Nahan, town, southern Himachal Pradesh state, northwestern India. It lies south-southeast of Shimla, the state capital, at the foot of the Siwalik (Shiwalik) Range.
Nahan is a trade centre for agricultural produce and timber. The town’s industries include hand weaving, wood carving, and iron working. It was the capital of the Punjab Hill State of Sirmur (Sirmaur) during British rule in India. Pop. (2001) 26,053; (2011) 28,899.